Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Passing backslash character to awk variable
Top Forums Shell Programming and Scripting Passing backslash character to awk variable Post 302732503 by Mudshark on Sunday 18th of November 2012 06:49:13 AM
Old 11-18-2012
Passing backslash character to awk variable
Hi All.
I have a file that contains some special characters and I'm trying to use AWK to search for lines between <pattern1> and <pattern2>.
As an example:
I need the lines between the line containing ' select_id="x_0 ' and the line containing the next instance of ' from '. This is a file called 'x.txt':

Code:
blah
set $a x_0 $b
blah (
q_db_task=1000, select_id="x_0", text=" select ",
blah=rec (
table="green", text="min(blue)", text="max(brown)",
text="sum(green.PURPLE)"
text="sum(green.BLACK)", text="sum(green.YELLOW)",
zed_var="$d MYCALC1SUM"
text="sum(green.PINK)",
)
from=" from ",
tablist="green", where="
blah
zed_var="$G 1", text="
blah
)
blah
from=" from",
blah

If I use the following then I get the output I need :
Code:
awk  '/select_id=\"x_0/,/from/' x.txt

(with the double quote escaped.)
However - the first search pattern might change so I need to pass that to awk as a variable.
E.G.
Code:
srvr# awk -v sqry='select_id=\\"x_0' '/sqry/,/from/' x.txt
awk: syntax error near line 1
awk: bailing out near line 1
and same using nawk returns nothing.
srvr# nawk -v sqry='select_id=\\"x_0' '/sqry/,/from/' x.txt
srvr#

But this works to match the first pattern using similar syntax.

srvr#
Code:
nawk -v sqry='select_id=\\"x_0' '$0 ~ sqry' x.txt

q_db_task=1000, select_id="x_0", text=" select ",

I think I fixed it using awk in a script :
Code:
BEGIN {awkvar2=sqry;awkvar3="from"}

($0 ~ awkvar2),($0 ~ awkvar3)

BUT - Any help to understand why the pattern match doesn't work would be much appreciated.
Last edited by Scrutinizer; 11-18-2012 at 08:54 AM.. Reason: code tags
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How ro handle backslash character in grep?

Hi , I am doing invert grep using -v but the string contain "/" which break the grep command and it do not skip the lines with "/" on it. Diffu.txt ======== 1159c1159 < <td align="right" valign="middle" class="paddingRight2px" id="featureListItemChannelButton7466"> --- > <td... (1 Reply)
Discussion started by: rajbal
1 Replies

2. Shell Programming and Scripting

remove backslash character from file

How do I remove a backslash character \ from a file? I have used sed -e "s|\||g" filename > newfile I have done several permutations on this to no avail such as: sed -e "s|`\`||g" filename > newfile sed -e "s|""\""||g" filename > newfile What am I doing wrong?:confused: ... (2 Replies)
Discussion started by: MissI
2 Replies

3. Shell Programming and Scripting

Passing variable and wild card character to grep in Perl

HI All, I have a script that needs to find out a list of files in a directory, i pass the search parameter as an argument. opendir ( DIR, $dir ) || die "Error in opening dir $dirname\n"; @filename1 = (grep {/$File_pattern/ } readdir(DIR)); The problem is my file patterns are like... (1 Reply)
Discussion started by: amit1_x
1 Replies

4. Shell Programming and Scripting

passing double backslash(\\) as a path in unix

Hi All, I am trying to add a tag in the *.imp file. This is a piece of code which I am giving in my template file and my script reads this template file attachment and passes to windows server(as they have provided the below file path). ... (3 Replies)
Discussion started by: defendersubbu
3 Replies

5. Shell Programming and Scripting

Passing variable to awk

Hi, I'm new with this stuff, but I hope you can help me. This is what I'm trying to do: for id in $var; do awk '{if ($1 == $id) print $2}' merg_data.dat > neigh.tmp done I need that for every "id", awk search the first column of the file merg_data.dat which contains "id" and... (3 Replies)
Discussion started by: matteo86
3 Replies

6. Shell Programming and Scripting

Passing awk variable argument to a script which is being called inside awk

consider the script below sh /opt/hqe/hqapi1-client-5.0.0/bin/hqapi.sh alert list --host=localhost --port=7443 --user=hqadmin --password=hqadmin --secure=true >/tmp/alerts.xml awk -F'' '{for(i=1;i<=NF;i++){ if($i=="Alert id") { if(id!="") if(dt!=""){ cmd="sh someScript.sh... (2 Replies)
Discussion started by: vivek d r
2 Replies

7. Shell Programming and Scripting

awk programming -Passing variable to awk for loop

Hi All, I am new to AWK programming. I have the following for loop in my awk program. cat printhtml.awk: BEGIN -------- <some code here> END{ ----------<some code here> for(N=0; N<H; N++) { for(M=5; M<D; M++) print "\t" D ""; } ----- } ... (2 Replies)
Discussion started by: ctrld
2 Replies

8. Shell Programming and Scripting

Replace special characters with backslash and character

Hi, I have a string wherein i need to replace special characters with backslash and that character. Ex: If my string is a=qwerty123@!, then the new string should be a_new=qwerty123\@\!\, Thanks (3 Replies)
Discussion started by: temp_user
3 Replies

9. Shell Programming and Scripting

[BASH] Getting a semi-tailing backslash when passing (escaped) variables to script

Heyas Figured me had a 'typo' in tui-conf-set, i went to fix it. Now, i also figured, it might be nice to have tui-conf-set report (to console, not only exit code) wether it could save the variable to the file or not. This said, I appended this code: (the tui-title and tui-echo lines are... (3 Replies)
Discussion started by: sea
3 Replies

10. Shell Programming and Scripting

awk with passing variable

I have file called in in.txt contains with the below lines I want to display the lines between the value which I would be passing. one two three four five ten six seven eight Expected output if I have passed one and ten two three four five (8 Replies)
Discussion started by: mychbears
8 Replies

LEARN ABOUT MOJAVE

ucblinks

ucblinks(1B)                                         SunOS/BSD Compatibility Package Commands                                         ucblinks(1B)

NAME

       ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices

SYNOPSIS

       /usr/ucb/ucblinks [-e rulebase] [-r rootdir]

DESCRIPTION

       ucblinks  creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi-
       ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry.

       ucblinks does not remove unneeded compatibility links; these must be removed by hand.

       ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been  created,
       since the reconfiguration may have resulted in more compatibility names being needed.

       In  releases prior to SunOS 5.4, ucblinks used a  nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses  nawk
       for the default operation, although  nawk rule-bases can still be specifed with the -e option.  The  nawk rule-base equivalent to the SunOS
       5.4 default operation can be found in /usr/ucblib/ucblinks.awk.

OPTIONS

       -e rulebase     Specify rulebase as the file containing nawk(1) pattern-action statements.

       -r rootdir      Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /.

FILES

       /usr/ucblib/ucblinks.awk        sample rule-base for compatibility links

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWscpu                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5)

SunOS 5.10                                                          13 Apr 1994                                                       ucblinks(1B)
All times are GMT -4. The time now is 11:19 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy